aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat
-rw-r--r--include/llvm/Target/TargetLowering.h8
-rw-r--r--lib/CodeGen/StackProtector.cpp17
-rw-r--r--lib/Target/X86/X86ISelLowering.cpp21
-rw-r--r--lib/Target/X86/X86ISelLowering.h6
-rw-r--r--test/CodeGen/PowerPC/stack-protector.ll25
-rw-r--r--test/CodeGen/X86/stack-protector-linux.ll28
-rw-r--r--test/CodeGen/X86/stack-protector.ll (renamed from test/CodeGen/Generic/stack-protector.ll)8
7 files changed, 107 insertions, 6 deletions
diff --git a/include/llvm/Target/TargetLowering.h b/include/llvm/Target/TargetLowering.h
index eb048f6d9f..497a025d53 100644
--- a/include/llvm/Target/TargetLowering.h
+++ b/include/llvm/Target/TargetLowering.h
@@ -749,6 +749,14 @@ public:
/// getFunctionAlignment - Return the Log2 alignment of this function.
virtual unsigned getFunctionAlignment(const Function *) const = 0;
+ /// getStackCookieLocation - Return true if the target stores stack
+ /// protector cookies at a fixed offset in some non-standard address
+ /// space, and populates the address space and offset as
+ /// appropriate.
+ virtual bool getStackCookieLocation(unsigned &AddressSpace, unsigned &Offset) const {
+ return false;
+ }
+
//===--------------------------------------------------------------------===//
// TargetLowering Optimization Methods
//
diff --git a/lib/CodeGen/StackProtector.cpp b/lib/CodeGen/StackProtector.cpp
index 8a6a727a1f..e318afe2b5 100644
--- a/lib/CodeGen/StackProtector.cpp
+++ b/lib/CodeGen/StackProtector.cpp
@@ -136,7 +136,7 @@ bool StackProtector::RequiresStackProtector() const {
bool StackProtector::InsertStackProtectors() {
BasicBlock *FailBB = 0; // The basic block to jump to if check fails.
AllocaInst *AI = 0; // Place on stack that stores the stack guard.
- Constant *StackGuardVar = 0; // The stack guard variable.
+ Value *StackGuardVar = 0; // The stack guard variable.
for (Function::iterator I = F->begin(), E = F->end(); I != E; ) {
BasicBlock *BB = I++;
@@ -155,7 +155,20 @@ bool StackProtector::InsertStackProtectors() {
//
PointerType *PtrTy = PointerType::getUnqual(
Type::getInt8Ty(RI->getContext()));
- StackGuardVar = M->getOrInsertGlobal("__stack_chk_guard", PtrTy);
+
+ unsigned AddressSpace, Offset;
+ if (TLI->getStackCookieLocation(AddressSpace, Offset)) {
+ Constant *ASPtr = Constant::getNullValue(
+ PointerType::get(Type::getInt8Ty(RI->getContext()), AddressSpace));
+ APInt OffsetInt(32, Offset);
+ Constant *OffsetVal = Constant::getIntegerValue(
+ Type::getInt32Ty(RI->getContext()), OffsetInt);
+ StackGuardVar = ConstantExpr::getPointerCast(
+ ConstantExpr::getGetElementPtr(ASPtr, &OffsetVal, 1),
+ PointerType::get(PtrTy, AddressSpace));
+ } else {
+ StackGuardVar = M->getOrInsertGlobal("__stack_chk_guard", PtrTy);
+ }
BasicBlock &Entry = F->getEntryBlock();
Instruction *InsPt = &Entry.front();
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 423a076e7d..8a0a04ee22 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -1189,6 +1189,27 @@ unsigned X86TargetLowering::getFunctionAlignment(const Function *F) const {
return F->hasFnAttr(Attribute::OptimizeForSize) ? 0 : 4;
}
+bool X86TargetLowering::getStackCookieLocation(unsigned &AddressSpace,
+ unsigned &Offset) const {
+ if (!Subtarget->isTargetLinux())
+ return false;
+
+ if (Subtarget->is64Bit()) {
+ // %fs:0x28, unless we're using a Kernel code model, in which case it's %gs:
+ Offset = 0x28;
+ if (getTargetMachine().getCodeModel() == CodeModel::Kernel)
+ AddressSpace = 256;
+ else
+ AddressSpace = 257;
+ } else {
+ // %gs:0x14 on i386
+ Offset = 0x14;
+ AddressSpace = 256;
+ }
+ return true;
+}
+
+
//===----------------------------------------------------------------------===//
// Return Value Calling Convention Implementation
//===----------------------------------------------------------------------===//
diff --git a/lib/Target/X86/X86ISelLowering.h b/lib/Target/X86/X86ISelLowering.h
index a7de0b1166..82cef27a63 100644
--- a/lib/Target/X86/X86ISelLowering.h
+++ b/lib/Target/X86/X86ISelLowering.h
@@ -593,6 +593,12 @@ namespace llvm {
/// getFunctionAlignment - Return the Log2 alignment of this function.
virtual unsigned getFunctionAlignment(const Function *F) const;
+ /// getStackCookieLocation - Return true if the target stores stack
+ /// protector cookies at a fixed offset in some non-standard address
+ /// space, and populates the address space and offset as
+ /// appropriate.
+ virtual bool getStackCookieLocation(unsigned &AddressSpace, unsigned &Offset) const;
+
private:
/// Subtarget - Keep a pointer to the X86Subtarget around so that we can
/// make the right decision when generating code for different targets.
diff --git a/test/CodeGen/PowerPC/stack-protector.ll b/test/CodeGen/PowerPC/stack-protector.ll
new file mode 100644
index 0000000000..2020361250
--- /dev/null
+++ b/test/CodeGen/PowerPC/stack-protector.ll
@@ -0,0 +1,25 @@
+; RUN: llc -march=ppc32 < %s -o - | grep {__stack_chk_guard}
+; RUN: llc -march=ppc32 < %s -o - | grep {__stack_chk_fail}
+
+@"\01LC" = internal constant [11 x i8] c"buf == %s\0A\00" ; <[11 x i8]*> [#uses=1]
+
+define void @test(i8* %a) nounwind ssp {
+entry:
+ %a_addr = alloca i8* ; <i8**> [#uses=2]
+ %buf = alloca [8 x i8] ; <[8 x i8]*> [#uses=2]
+ %"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
+ store i8* %a, i8** %a_addr
+ %buf1 = bitcast [8 x i8]* %buf to i8* ; <i8*> [#uses=1]
+ %0 = load i8** %a_addr, align 4 ; <i8*> [#uses=1]
+ %1 = call i8* @strcpy(i8* %buf1, i8* %0) nounwind ; <i8*> [#uses=0]
+ %buf2 = bitcast [8 x i8]* %buf to i8* ; <i8*> [#uses=1]
+ %2 = call i32 (i8*, ...)* @printf(i8* getelementptr ([11 x i8]* @"\01LC", i32 0, i32 0), i8* %buf2) nounwind ; <i32> [#uses=0]
+ br label %return
+
+return: ; preds = %entry
+ ret void
+}
+
+declare i8* @strcpy(i8*, i8*) nounwind
+
+declare i32 @printf(i8*, ...) nounwind
diff --git a/test/CodeGen/X86/stack-protector-linux.ll b/test/CodeGen/X86/stack-protector-linux.ll
new file mode 100644
index 0000000000..fe2a9c5d57
--- /dev/null
+++ b/test/CodeGen/X86/stack-protector-linux.ll
@@ -0,0 +1,28 @@
+; RUN: llc -mtriple=i386-pc-linux-gnu < %s -o - | grep %gs:
+; RUN: llc -mtriple=x86_64-pc-linux-gnu < %s -o - | grep %fs:
+; RUN: llc -code-model=kernel -mtriple=x86_64-pc-linux-gnu < %s -o - | grep %gs:
+; RUN: llc -mtriple=x86_64-apple-darwin < %s -o - | grep {__stack_chk_guard}
+; RUN: llc -mtriple=x86_64-apple-darwin < %s -o - | grep {__stack_chk_fail}
+
+@"\01LC" = internal constant [11 x i8] c"buf == %s\0A\00" ; <[11 x i8]*> [#uses=1]
+
+define void @test(i8* %a) nounwind ssp {
+entry:
+ %a_addr = alloca i8* ; <i8**> [#uses=2]
+ %buf = alloca [8 x i8] ; <[8 x i8]*> [#uses=2]
+ %"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
+ store i8* %a, i8** %a_addr
+ %buf1 = bitcast [8 x i8]* %buf to i8* ; <i8*> [#uses=1]
+ %0 = load i8** %a_addr, align 4 ; <i8*> [#uses=1]
+ %1 = call i8* @strcpy(i8* %buf1, i8* %0) nounwind ; <i8*> [#uses=0]
+ %buf2 = bitcast [8 x i8]* %buf to i8* ; <i8*> [#uses=1]
+ %2 = call i32 (i8*, ...)* @printf(i8* getelementptr ([11 x i8]* @"\01LC", i32 0, i32 0), i8* %buf2) nounwind ; <i32> [#uses=0]
+ br label %return
+
+return: ; preds = %entry
+ ret void
+}
+
+declare i8* @strcpy(i8*, i8*) nounwind
+
+declare i32 @printf(i8*, ...) nounwind
diff --git a/test/CodeGen/Generic/stack-protector.ll b/test/CodeGen/X86/stack-protector.ll
index a59c649781..f0fc4ddbd6 100644
--- a/test/CodeGen/Generic/stack-protector.ll
+++ b/test/CodeGen/X86/stack-protector.ll
@@ -1,5 +1,5 @@
-; RUN: llc < %s -o - | grep {__stack_chk_guard}
-; RUN: llc < %s -o - | grep {__stack_chk_fail}
+; RUN: llc -march=x86 < %s -o - | grep {__stack_chk_guard}
+; RUN: llc -march=x86 < %s -o - | grep {__stack_chk_fail}
@"\01LC" = internal constant [11 x i8] c"buf == %s\0A\00" ; <[11 x i8]*> [#uses=1]
@@ -7,12 +7,12 @@ define void @test(i8* %a) nounwind ssp {
entry:
%a_addr = alloca i8* ; <i8**> [#uses=2]
%buf = alloca [8 x i8] ; <[8 x i8]*> [#uses=2]
- %"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
+ %"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
store i8* %a, i8** %a_addr
%buf1 = bitcast [8 x i8]* %buf to i8* ; <i8*> [#uses=1]
%0 = load i8** %a_addr, align 4 ; <i8*> [#uses=1]
%1 = call i8* @strcpy(i8* %buf1, i8* %0) nounwind ; <i8*> [#uses=0]
- %buf2 = bitcast [8 x i8]* %buf to i8* ; <i8*> [#uses=1]
+ %buf2 = bitcast [8 x i8]* %buf to i8* ; <i8*> [#uses=1]
%2 = call i32 (i8*, ...)* @printf(i8* getelementptr ([11 x i8]* @"\01LC", i32 0, i32 0), i8* %buf2) nounwind ; <i32> [#uses=0]
br label %return
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-17 10:51:02 +0000